doc/ci/quick_start/README: improve sentence about link to a Lint tool

What does this MR do?

It improves the doc/ci/quick_start/README.md documentation.

Are there points in the code the reviewer needs to double check?

The reviewer can check that there is no more CI settings menu and that the Lint tool can be accessed under Pipelines > Pipelines and Pipelines > Builds.

Why was this MR needed?

Because the CI quick start documentation was not correct.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

It is not a code change so I don't think the below criteria are relevant.

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

I didn't check if there was an issue for this.